Malicious PDF — malware analysis report

Static analysis result for SHA-256 644725bec777ff16…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 21:37:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7cdbe40e02800c10778a798458ad80b7 SHA-1: 26f2684fe8d7c83a579700fe35ff70a5302fc89f SHA-256: 644725bec777ff161761fb1f6e576dde14e2b1cbce7fe84da8db902c5fdd6927
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free Robux' and game hacks, directing users to a malicious URL. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to redirect users to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/431946152/robuxy-com-free-robux-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pokemon-go-free-money_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005178.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5178 25968 bytes
SHA-256: 61c14e84da0b726f37fcc445b5460065b3a4ac9cd58cc739ae9afe934dfca01e
font_01_sfnt_off00008e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E33 2920 bytes
SHA-256: c7e9901fa31197f05be3574af75ee6c1c04c2edb7701683f04076d57bd6f3bee
font_02_sfnt_off00009835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9835 18452 bytes
SHA-256: 502ad6067225007cfeab5155f8ca615546b56d7ab4478b734f537abd02c25d18

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